How Long Does a Design-Build Project Take in Toronto?

"How long is this going to take?" is right up there with "how much will it cost?" as the first thing every homeowner wants to know. And like cost, the answer depends on the type of project you are building. But after completing over 300 projects across the GTA, we can give you grounded timelines based on what we actually see — not the optimistic estimates that some builders use to close a deal.

## Garden Suites: 8 to 12 Months

A garden suite — whether it is a laneway suite or a backyard garden suite — typically takes 8 to 12 months from the day you engage a design-build team to the day a tenant moves in. That breaks down roughly as follows: design and architectural drawings take four to six weeks. Engineering and permit submission add another two to three weeks. The City of Toronto's permit review takes six to ten weeks for a standard garden suite application. Construction itself runs four to six months, depending on size and complexity.

The variables that push garden suite timelines toward the longer end include two-storey laneway suites (more structural complexity), challenging site access that requires a crane or hand-carrying materials, soil conditions that require engineered foundations, and winter construction which slows exterior work. A straightforward one-storey garden suite on an accessible lot with a spring start date is often at the eight-month mark. A two-storey laneway suite on a tight lot with a fall start date is closer to twelve.

## Renovations: 3 to 8 Months

Renovation timelines vary more than any other project type because "renovation" covers everything from a single bathroom refresh to a whole-house gut. Here is how the most common renovation types break down.

A kitchen renovation with layout changes runs three to four months total: two to three weeks of design, three to four weeks for permits (if structural or plumbing changes are involved), and eight to twelve weeks of construction. A bathroom renovation is similar but shorter on the construction end — six to eight weeks of build time for most projects.

A basement conversion into a legal secondary suite takes four to six months: a month of design and engineering, six to eight weeks for permits, and two to three months of construction. The permit timeline is longer because secondary suites trigger more detailed code review for fire safety, egress, and separate mechanical systems.

A full-home renovation — stripping a house to the studs and rebuilding the interior — runs six to ten months: one to two months of design and permitting, and five to eight months of construction. These are complex projects where the design phase is especially important, because decisions made on paper cost nothing to change while decisions made on site after framing is complete can cost thousands.

## New Custom Homes: 12 to 18 Months

Building a new custom home in Toronto from scratch takes 12 to 18 months from initial design engagement to move-in. The pre-construction phase — design, engineering, and city permits — accounts for three to six months. Construction takes eight to twelve months depending on the size and complexity of the home, site conditions, and the time of year you break ground.

Toronto-specific factors that affect new-build timelines include excavation challenges on lots with mature trees and neighboring structures in close proximity, the city's permit review backlog (which fluctuates seasonally), and coordinating utility connections with Toronto Hydro and the water department. Starting the design process in fall, submitting permits in winter, and breaking ground in spring aligns with the city's rhythms and the construction season for the most efficient timeline.

## Multiplexes: 12 to 18 Months

Duplex, triplex, and fourplex projects follow a similar timeline to custom homes, with additional complexity in the permitting phase. A multiplex permit application requires more detailed documentation — fire separation details, accessibility compliance, parking calculations, and sometimes a site plan agreement. This can add two to four weeks to the permit review compared to a single-family home.

Construction timelines for multiplexes scale with unit count. A duplex takes eight to twelve months to build. A triplex runs ten to fourteen months. A fourplex can take twelve to sixteen months. The incremental time comes from additional fire-rated assemblies, more complex mechanical systems (each unit needs its own HVAC, electrical panel, and plumbing connections), and the finish work required for multiple kitchens and bathrooms.

## What Affects Every Timeline: The Six Variables

Across all project types, six factors consistently determine whether your project finishes on the early or late end of its range.

First, permit review speed. The City of Toronto's review timelines are published but not guaranteed. Submitting a complete, code-compliant application the first time eliminates revision cycles — each of which adds two to four weeks. This is one of the biggest advantages of working with an experienced design-build firm: we know what the plan examiners expect.

Second, design changes after construction starts. This is the single most expensive and time-consuming variable in any project. Moving a wall on paper takes five minutes. Moving a wall after framing, electrical, and plumbing are roughed in can take weeks and cost thousands. Investing in the design phase — detailed drawings, 3D renderings, and material selections finalized before groundbreaking — is the most effective way to protect your timeline.

Third, weather. Toronto gives builders a reliable construction season from April through November. Winter work is possible but slower. Rain delays during excavation and foundation work can add a week or two. An early freeze can push exterior finishing work into spring. Projects that break ground in spring have the best chance of finishing on schedule.

Fourth, material lead times. Custom windows, imported tile, specialty fixtures, and even standard cabinetry can have lead times of six to twelve weeks. At Metrohomes, we order long-lead items during the design and permit phase so they arrive on site when needed — not weeks after the crew is ready for them.

Fifth, site conditions. Soil quality, existing underground utilities, tree root systems, and proximity to neighboring structures can all add time to the excavation and foundation phase. A geotechnical report before construction starts identifies these conditions early.

Sixth, inspection scheduling. City inspectors must sign off at key milestones — footings, framing, insulation, rough-ins, and final. If an inspection fails, corrections and re-inspection add time. Building to code the first time, with experienced tradespeople, keeps the inspection process on track.

## The Design-Build Advantage: Overlapping Phases

One of the biggest timeline advantages of the design-build model is the ability to overlap phases that would be sequential in a traditional architect-then-contractor process. While the city reviews your permit, we are finalizing material selections, ordering long-lead items, and scheduling trades. When the permit is issued, we are ready to start — not spending weeks mobilizing. This parallel-track approach typically saves four to eight weeks on the overall timeline compared to the traditional model.

If you are wondering what timeline applies to your specific project, our Property Assessment evaluates your property and gives you a starting point. For a detailed timeline and scope discussion, a consultation with our team will map out the phases, the milestones, and a realistic completion date.

At Metrohomes, every project gets a detailed construction schedule before work begins, updated weekly throughout the build. From new builds in Scarborough to renovations in Etobicoke, our clients always know where their project stands and when it will be finished. After 38 years of building in Toronto, we have learned that the best way to stay on schedule is to plan thoroughly, build carefully, and communicate constantly.